See at a Glance Who Is Where! Strengthen On-site Safety Management with Real-time Worker Location Management

Table of Contents

• Why managing on-site worker locations is important

• Benefits of real-time worker location management

• Technologies and methods for real-time worker location tracking

• Key points and cautions when implementing

• Simple surveying with LRTK

• FAQ

Why managing on-site worker locations is important

Accurately knowing where workers are on manufacturing or construction sites is indispensable for both safety management and operational efficiency. On large factories or construction sites, many workers move around simultaneously in various locations, and it is not easy to always know “who is working where right now.” If location information cannot be obtained, managers must check each person’s whereabouts by radio or phone or walk around the expansive site to find them, causing significant time loss and wasted effort.

Moreover, not being able to know workers’ locations in real time directly affects safety. For example, if a worker unintentionally enters a hazardous area and their location cannot be determined in real time, you cannot immediately warn them. In sites where forklifts or heavy machinery operate, driving without knowing whether people are nearby increases the risk of collision accidents. In the event of a fire or disaster, if you cannot determine where each worker is, it becomes difficult to evacuate everyone quickly, greatly increasing the risk to human life.

Thus, the state of “workers’ locations are not visible” leads to various problems. What’s attracting attention is a system of real-time location management that allows you to always know workers’ positions. The next chapter looks at its benefits and the changes it brings to the site.

Benefits of real-time worker location management

Visualizing workers’ locations in real time dramatically improves and advances site management. If all workers on site are displayed on a map, managers can see at a glance who is where even from the office. This enables immediate judgment about whether “workers are concentrated in a particular area” or “the right personnel are assigned to necessary tasks,” allowing for efficient staffing with no waste. If workers are too far apart, you can send reinforcements; if they are overly concentrated in one spot, you can redistribute them—giving flexible instructions according to the situation. Also, even on large sites, because you can see who is closest, you can contact and give instructions to the appropriate person immediately without calling multiple people by radio or phone to confirm whereabouts.

Improved safety is another major benefit of real-time location management. If you can always know each worker’s current location, you can prevent entry into hazardous areas in advance. Some location management systems include a geofence function (virtual restricted-area settings) that automatically triggers an alarm or sends a warning notification to the worker’s device when they approach a preconfigured area. This helps prevent inadvertent entry into restricted areas due to human error. It can also detect and alert when an unqualified worker attempts to enter an area that requires specific certification, ensuring compliance with safety rules.

Real-time tracking also enhances emergency responsiveness. In an accident or disaster, you can quickly identify “who remains where,” enabling prompt rescue and evacuation guidance. For example, even if a fire breaks out during underground work or inside a plant, you can immediately check on the system whether anyone has not yet evacuated and take appropriate action. Additionally, by collecting and analyzing workers’ movement history data, you can gain insights that lead to operational improvements, such as which times and locations tend to become congested or whether unnecessary movements are occurring. Using location information thus contributes not only to safety management but also to overall productivity improvement on site.

As an ancillary effect, location management also helps with the management of tools and equipment—tracking the whereabouts of objects. By attaching tags to important materials and tracking them, time spent searching for “missing equipment” is reduced. If you set alerts to notify when materials are removed from designated storage areas, it also helps prevent theft or loss. By centrally managing the locations of people and things, you can achieve safe and efficient site operations.

Technologies and methods for real-time worker location tracking

So what technologies can realize real-time worker location management? Outdoors on large sites, satellite positioning such as GPS can be used, but inside buildings or underground where GPS signals do not reach, other positioning methods are necessary. Representative technologies currently used on sites include the following.

• GPS (GNSS): An outdoor positioning technology using global navigation satellite systems. In open outdoor environments, a worker’s smartphone or a dedicated receiver can capture GPS satellite signals to determine position. Accuracy is on the order of several meters (several ft), but when combined with RTK (Real-Time Kinematic) technology that uses correction information from a base station, centimeter-level high precision (cm level accuracy (half-inch accuracy)) can be achieved. GPS is the basic choice for capturing positions across wide construction sites or plant grounds.

• BLE beacons: A short-range radio technology using Bluetooth Low Energy. Small transmitters (beacons) are installed throughout the site, and a worker’s smartphone or a receiving tag estimates position from signal strength and ID information. Accuracy is generally on the order of a few meters (a few ft), but because beacons are battery-powered and do not require wiring, and device costs are low, they are easy to introduce. Also, BLE signals have limited range, so workers who leave the site are less likely to be detected—an advantage for privacy.

• UWB (Ultra-Wideband): A high-precision indoor positioning technology using a wide frequency band in the GHz range. Dedicated UWB tags are attached to workers’ helmets or belongings, and position is triangulated by measuring radio round-trip times with multiple antennas (fixed stations) installed on site. Nanosecond-level precise distance measurement enables accuracy within a few tens of centimeters (a few tens of in). UWB provides stable accuracy indoors, but equipment costs are higher than beacons and tags and antennas require initial installation work. This method is attracting attention for large factories, plant construction sites, and tunnel work where precision is especially important.

• RFID: A radio-based ID recognition technology applied to material management. Active RFID (battery-powered) tags can be attached to materials and detected by on-site readers to automatically record their locations. Passive RFID (batteryless) is only detected when brought close to a reader, but it is useful for applications such as installing gates to automatically log material check-in and check-out.

These technologies are often combined according to site environment and needs. For example, GPS can provide rough positioning outdoors, and when workers enter a building the system can automatically switch to UWB or BLE for precise tracking. Devices carried by workers also vary: one approach is to install a dedicated app on smartphones to act as transmitters, while another is to have workers carry small tags attached to safety helmets or workwear. Signals transmitted from these devices are aggregated by receivers installed on site and analyzed on cloud servers to plot all workers’ current locations on a map.

Key points and cautions when implementing

When introducing a real-time location management system on site, there are technical and operational points you should keep in mind. First, on the technical side, it is important to choose a positioning method suited to the scale and structure of the site. In steel-frame buildings, radio waves are easily reflected or attenuated, so you need to plan antenna and beacon locations carefully and deploy enough devices to avoid blind spots. Use UWB when high accuracy is required, and BLE beacons when ease of deployment is prioritized—select technologies according to purpose.

Next, on the operational side, introduce the system in a way that integrates smoothly with on-site workflows. If you track workers via smartphones, ensure that smartphones can be used continuously on site (provide waterproof cases, establish habits for carrying them, etc.). If distributing dedicated tags, choose designs that attach to helmets or safety belts without getting in the way and manage them to prevent loss. For battery-powered devices, plan regular charging and battery replacement schedules so the system does not stop when it is most needed.

A phased implementation is also key to success. Start with a limited proof of concept (PoC) to verify effectiveness before full-scale deployment. For example, try tracking worker positions on a single floor first and collect data to see how much efficiency improves. Once effectiveness is confirmed, gradually expand the coverage to avoid disrupting the site and to enable smooth overall rollout.

Also be cautious about handling the location data you collect. Respect workers’ privacy by limiting collected information to what is necessary for business, and manage data securely. Make it clear that tracking is for safety and efficiency—not surveillance—and create an environment where everyone on site can feel comfortable using the system.

Simple surveying with LRTK

To realize real-time location management, it is not enough to build positioning infrastructure; you also need to know the accurate coordinates of buildings and reference points. For example, even when installing beacons or antennas, pre-measuring the coordinates of their installation locations enables more accurate position display in the system. Traditional surveying often required specialists and expensive equipment, which reduced responsiveness on site.

LRTK-based simple surveying is attracting attention as a solution. LRTK is an innovative tool that achieves centimeter-level high precision (cm level accuracy (half-inch accuracy)) in cooperation with smartphones or tablets. By simply attaching a compact dedicated receiver to a smartphone, anyone can easily obtain accurate position coordinates. For example, if a construction manager walks the site measuring important points with LRTK, interior surveys and equipment installation positions can be quickly digitized. Tasks that previously required hiring a surveying company can be handled in a short time by on-site personnel, realizing the concept of “measure when needed.”

Our LRTK immediately uploads acquired coordinate data to the cloud, allowing real-time checking from office PCs. This lets you verify on the spot whether measured points match the drawings and share data with remote team members to continue work. It also includes versatile functions beyond basic surveying, such as height (elevation) measurement, distance and area calculation, and AR (augmented reality) guidance for installation positions—making it an all-purpose on-site tool.

LRTK-based simple surveying is a powerful aid when building infrastructure for real-time worker location management. For example, when deploying beacons for indoor positioning systems, measuring and registering each beacon’s exact position with LRTK improves subsequent tracking accuracy. When renovating existing buildings, LRTK lets you quickly capture current dimensions and layouts. Using these modern tools makes indoor location management of people and things smoother and more accurate.

The LRTK series also supports i-Construction promoted by the Ministry of Land, Infrastructure, Transport and Tourism, and is a cutting-edge solution that strongly supports digitalization in the construction industry. Real-time data use will significantly change how work is done on site. Leverage location information to achieve dramatic improvements in safety and productivity.

FAQ

Q1. Can worker locations be tracked in real time indoors? A. Yes, it is possible. Conventional GPS is a satellite-based positioning system, but indoors satellite signals are often blocked by building structures, making it difficult for GPS receivers to capture satellites and determine position. To obtain accurate indoor location information, you need to use dedicated indoor positioning technologies (such as beacons or UWB) that replace GPS.

Q2. What devices or technologies are needed to track workers? A. Various technologies are used depending on application and accuracy requirements. A common easy method is to install Bluetooth beacons on site and have workers’ smartphones or dedicated tags receive signals to determine location. For higher accuracy, UWB tags and antennas are effective. Other technologies—RFID for material management, GPS for wide outdoor areas, and camera-based analysis—can also be combined as needed.

Q3. How accurate is real-time location information? A. Accuracy varies by technology: BLE beacons typically offer on the order of several meters (several ft), while UWB can provide accuracy on the order of a few tens of centimeters (a few tens of in). Wi‑Fi positioning depends on the environment but is said to have errors ranging from several meters to over ten meters (several ft to a dozen ft). Choose the appropriate technology based on required accuracy—for example, use beacons for low-cost systems when meter-level accuracy is sufficient, and consider UWB when finer precision is needed.

Q4. How much does it cost to implement a location management system? A. Implementation cost varies greatly depending on the chosen technology and site scale. Beacon-based systems are relatively inexpensive and can sometimes be started with a few dozen beacons and application fees. High-precision systems like UWB have higher per-unit costs for tags and antennas and require substantial investment to cover large areas. However, IoT diffusion has been lowering device prices in recent years, and you can start small and expand gradually while verifying effectiveness. It is recommended to begin with a trial deployment to confirm cost-effectiveness.

Q5. How is employee privacy protected? A. When introducing the system, limit collected data to what is necessary for business. For example, do not monitor detailed movements outside working hours or during breaks, and configure the system with privacy-conscious settings. Manage data access rights to prevent unauthorized viewing of individual movement histories. Emphasize that location information is used for safety management and operational efficiency, not surveillance, to reassure employees. Using BLE beacons has the added advantage that signals only reach on the order of tens of meters (tens of ft), so workers who leave the site are less likely to be detected and privacy outside working hours is easier to protect.

Q6. Is there an easy way to perform high-precision surveying or layout positioning? A. Traditionally, dedicated surveying instruments were required for high-precision surveying on site, but recently there are simple surveying tools that use smartphones. A representative example is LRTK. With LRTK, you connect a small positioning device to a smartphone and anyone can achieve centimeter-level positioning (cm level accuracy (half-inch accuracy)). With a single button you can record coordinates without complex operations, so people without surveying expertise can use it. This lets you measure reference points yourself when installing indoor positioning systems or quickly perform layout positioning during construction, contributing to improved accuracy of location management.